CN103713244B - A kind of live detection method for distribution cable shelf depreciation - Google Patents
A kind of live detection method for distribution cable shelf depreciation Download PDFInfo
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Abstract
A kind of measuring device with electricity for distribution cable shelf depreciation and method, detection device includes Pulsed Magnetic Field Sensors, Pulsed Electric Field Sensors and pulse signal Sequence Detector；Present invention is mainly used for the live detection of 10kV distribution cable shelf depreciation, aim to solve the problem that current state of insulation detection method the most fixedly mounted, on-line measurement exists costly, the problem such as poor anti jamming capability, with portable, live detection as core concept, provide reliable, safe, economic detection means for the cables installed a large amount of in distrbution network；The present invention differentiates by introducing crucial two-way detection signal and signal sequence, it is achieved that distinguishing of internal shelf depreciation and external noise；By the non-intruding access way of two paths of signals, it is achieved that the portability of system, improve Detection results and work efficiency, it is ensured that the Technical Economy of detection means comprehensively；Detection device can tolerate 20kV voltage, and weight, less than 3kg, uses safe, light, is suitable for Utilities Electric Co. and carries out the live detection of cable insulation state in intelligent grid construction and management.
Description
Technical field
The present invention relates to electric device state of insulation detection technique and application thereof during intelligent grid is built, particularly relate to the detection technique of cable insulation state.
Background technology
Distribution cable usage amount in electrical network is very big, for improving its operational reliability, installs a large amount of online condition checkout gears for electricity consumption enterprise.By measuring intensity and the motion frequency of the pulsed amperometric signal on cable grounding line, it is achieved the detection of distribution cable state of insulation and fault diagnosis.
China is for electricity consumption enterprise practice have shown that in recent years, there are two problems in actual applications in above-mentioned detection method, 1) problem of poor anti jamming capability, such as: under many circumstances, electromagnetic interference can pass through grounded screen, ground connection busbar, the high-tension switch cabinet/ring main unit etc. of terminal travel on cable grounding line；It addition, the earth lead of a plurality of cable feeder line often the most first links together in distribution, the pulse current of PD between different cables also can interfere with each other, it is difficult to determines the true cable that shelf depreciation occurs, affects diagnosis effect；2) a large amount of online detection device is fixedly mounted, costly, less economical.
In view of the above circumstances, in order to solve the at present problem such as anti-interference problem, deficiency in economic performance present in a large amount of online 10kV distribution cable live testing apparatus for local discharge installed, how to design and make a kind of local discharge detection device, can live detection and install without a large amount of, have simultaneously and use safety, portable feature, be in cable status context of detection important topic urgently to be resolved hurrily for electricity consumption enterprise.
Summary of the invention
The present invention provides a kind of measuring device with electricity for distribution cable shelf depreciation, there is feature safe, portable, efficient, solve current existing detecting system and be difficult to external disturbance and the technical difficulty of the internal local discharge signal of real cable, achieve live detection, improve the technical merit of association area and compensate for the deficiency that existing online measuring technique exists.
The purpose of the present invention realizes by following technical solution:
A kind of measuring device with electricity for distribution cable shelf depreciation, it is characterized in that: include Pulsed Magnetic Field Sensors, Pulsed Electric Field Sensors and pulse signal Sequence Detector, Pulsed Magnetic Field Sensors and Pulsed Electric Field Sensors are connected with pulse signal Sequence Detector by high frequency signal cable respectively, pulse signal Sequence Detector can receive and locate reason Pulsed Magnetic Field Sensors and the two pulse signals of Pulsed Electric Field Sensors offer, and according to the order of arrival of pulse in two pulse signals, intensity and frequency, judge whether cable exists the active level of shelf depreciation and electric discharge.
Further, described pulse signal Sequence Detector is provided with the display screen for showing two pulse signals waveform.
Further, described Pulsed Magnetic Field Sensors includes housing, the coil being arranged in housing, resistance, discharge tube and BNC connector.
Further, described Pulsed Electric Field Sensors includes housing, the electrode being arranged in housing, lead-in wire, resistance, discharge tube and BNC connector.
Further, described pulse signal Sequence Detector includes that housing, the BNC connector being arranged in housing, wave filter, signal amplify and sample circuit, processor and display screen, wherein, BNC connector, wave filter, signal amplification and sample circuit, processor and display screen are contacted successively.
Further, described housing is insulant.
A kind of live detection method for distribution cable shelf depreciation, comprises the steps:
(1), by Pulsed Magnetic Field Sensors it is sticked on cable grounding line, Pulsed Electric Field Sensors is sticked on the watch window of cable termination switch cubicle or ring main unit；
(2), pulse signal Sequence Detector receives and locates reason Pulsed Magnetic Field Sensors and the two pulse signals of Pulsed Electric Field Sensors offer, and judge cable whether shelf depreciation according to following steps: if a Pulsed Magnetic Field Sensors and Pulsed Electric Field Sensors are all not detected by signal, or the signal detected is the most weak, so can be determined that in cable and do not have shelf depreciation to occur, cable is intact；
If b only Pulsed Magnetic Field Sensors detects signal, then can be determined that as interference signal；
If c Pulsed Magnetic Field Sensors and Pulsed Electric Field Sensors all detect signal, and after Pulsed Magnetic Field Sensors signal waveform occurs in Pulsed Electric Field Sensors waveform, then can be determined that as interference signal；
If d Pulsed Magnetic Field Sensors and Pulsed Electric Field Sensors all detect signal, and before Pulsed Magnetic Field Sensors signal waveform occurs in Pulsed Electric Field Sensors waveform, then can be determined that and cable exists shelf depreciation, cable exists potential defect.
There is advantages that
1, the sensor outer housing in the present invention, host housing have the dielectric level of 20kV, and therefore testing staff can operate this instrument the most safely；
2, inventive sensor weight is less than 200g, and volume is again smaller than 4cm × 5cm × 5cm, it is simple to carry；
When 3, using the present invention to carry out Site Detection, Pulsed Magnetic Field Sensors only need to be clipped on cable grounding line by operator, and Pulsed Electric Field Sensors is close on the watch window of cable termination switch cubicle/ring main unit to detect easily activity intensity and the motion frequency of the shelf depreciation produced because of defect in cable.May diagnose that whether cable occurs shelf depreciation by the relative analysis of two kinds of sensor detection signal, improve detection and the reliability of diagnosis and work efficiency.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of the Pulsed Magnetic Field Sensors that the present invention provides.
Fig. 3 is the structural representation of the Pulsed Electric Field Sensors that the present invention provides.
Fig. 4 is the structural representation of the pulse signal Sequence Detector that the present invention provides.
Fig. 5 is the circuit diagram of the pulse signal Sequence Detector wave filter that the present invention provides.
Fig. 6 is the oscillogram that pulse signal Sequence Detector shows.
Fig. 7 is the use state diagram of the present invention.
Detailed description of the invention
As it is shown in figure 1, a kind of measuring device with electricity for distribution cable shelf depreciation, it is mainly used in the live detection of 10kV distribution cable shelf depreciation;Detection device includes Pulsed Magnetic Field Sensors, Pulsed Electric Field Sensors and pulse signal Sequence Detector, Pulsed Magnetic Field Sensors and Pulsed Electric Field Sensors are connected with pulse signal Sequence Detector by high frequency signal cable respectively, pulse signal Sequence Detector can receive and locate reason Pulsed Magnetic Field Sensors and the two pulse signals of Pulsed Electric Field Sensors offer, and according to the order of arrival of pulse, intensity and frequency in two pulse signals, it is judged that whether cable exists the active level of shelf depreciation and electric discharge.
As in figure 2 it is shown, Pulsed Magnetic Field Sensors 11 is made up of square shell 21, coil 22, resistance 23, discharge tube 24 and BNC connector 25.Major components parameter meets condition: the line footpath of (1) coil 22 is not more than 1mm, the number of turn 1 circle；(2) resistance value 1000 Ω of resistance 24；(3) discharge voltage of discharge tube 24 is 30V；(4) joint 25 uses common banana plug (BNC)；
As it is shown on figure 3, Pulsed Electric Field Sensors 12 is made up of hemispherical shell 31, electrode 32, lead-in wire 33, resistance 34, discharge tube 35, BNC connector 36.Major components parameter meets condition: the thickness of (1) electrode 32 is less than 0.2mm, area 30X30mm2；(2) resistance 1000 Ω of resistance 34；(3) discharge voltage of discharge tube 35 is 30V；(4) joint 36 uses common banana plug (BNC)；
The a length of 2m of high frequency signal cable 13.
As shown in Figure 4, signal condition and display unit 14, it is made up of shell 41, BNC connector 42, wave filter 43, signal amplification and sample circuit 44, processor 45, display screen 46.Formant meets condition: a width of 3-40MHz of band of (1) wave filter 43；(2) signal amplifies and the amplification at least 40dB of sample circuit 44 and sample rate 100MBPS；(3) processor 45 uses the arm processor of dominant frequency 600MHz；(4) display screen 46 can use 4 cun of screens, and resolving power is not less than 400X200；
As it is shown in figure 5, the basic structure of wave filter 43.By inductance L51, inductance L52, inductance L53, inductance L54, inductance L55, electric capacity C51, electric capacity C52, electric capacity C53, electric capacity C54, electric capacity C55, electric capacity C56, electric capacity C57 is trapezoidal is formed by connecting.The parameter value of above-mentioned each inductance is: L51=220nH, L52=220nH, L53=2.2uH, L54=1.3uH, L55=2.2uH；The parameter of each electric capacity is: C51=73pF, C52=125pF, C53=73pF, C54=2.3nF, C55=588pF, C56=588pF, C57=2.3nF；
Shell 21, shell 31, shell 51 all use the epoxy resin insulation material that 2mm is thick.
Detection main frame comprises signal processing analysis software, its always function be that the sequential of the signal that has that it's too late according to the Pulsed Electric Field Sensors passage two pulse signals on Pulsed Magnetic Field Sensors passage on earth lead and observation window provides following test result, with reference to Fig. 6 and Fig. 7:
(1) if Pulsed Magnetic Field Sensors passage 61 and Pulsed Electric Field Sensors passage 62 are all not detected by signal, or the signal detected the most weak (such as, less than 5mV), then can be determined that and do not have shelf depreciation to occur in cable, cable is intact；
(2) if only Pulsed Magnetic Field Sensors passage 61 detects signal, then can be determined that as interference signal；
(3) if Pulsed Magnetic Field Sensors passage 61 and Pulsed Electric Field Sensors passage 62 all detect signal, and after waveform 61 occurs in waveform 62, then can be determined that as interference signal；
(4) if Pulsed Magnetic Field Sensors passage 61 and Pulsed Electric Field Sensors passage 62 all detect signal, and before waveform 61 occurs in waveform 62, then can be determined that and cable exists shelf depreciation, cable exists potential defect；
The on-the-spot application mode of the present invention is as it is shown in fig. 7, there are 2 adjacent feeder cabinets 70 in transformer station.Cable 73,74 is linked on transformer station's junctor 77 by earth lead 75, and node is 76；Pulsed Magnetic Field Sensors is clipped on earth lead 75, and Pulsed Magnetic Field Sensors is placed on the observation window 71 of switch cubicle, defines two sense channels 78 and 79.
Visible, the present invention solves the at present problem such as anti-interference problem, deficiency in economic performance present in a large amount of online 10kV distribution cable live testing apparatus for local discharge installed, it is possible to live detection and install without a large amount of, have simultaneously and use safety, portable feature.
The above, only presently preferred embodiments of the present invention, therefore the scope that the present invention implements, the equivalence change i.e. made and modification can not be limited according to scope of the present invention patent and description with this, all should still remain within the scope of the patent.
Claims (1)
1., for a live detection method for distribution cable shelf depreciation, comprise the steps:
(1), Pulsed Magnetic Field Sensors is sticked on cable grounding line, Pulsed Electric Field Sensors is sticked
On the watch window of cable termination switch cubicle or ring main unit；
(2), pulse signal Sequence Detector receives and locates reason Pulsed Magnetic Field Sensors and impulse electric field sensing
The two pulse signals that device provides, and judge cable whether shelf depreciation according to following steps: if a pulse
Magnetic field sensor and Pulsed Electric Field Sensors are all not detected by signal, or the signal detected is the most weak, that
Can be determined that and do not have shelf depreciation to occur in cable, cable is intact；
If b only Pulsed Magnetic Field Sensors detects signal, then can be determined that as interference signal；
If c Pulsed Magnetic Field Sensors and Pulsed Electric Field Sensors all detect signal, and pulsed magnetic field passes
After sensor signal waveform occurs in Pulsed Electric Field Sensors waveform, then can be determined that as interference signal；
If d Pulsed Magnetic Field Sensors and Pulsed Electric Field Sensors all detect signal, and pulsed magnetic field passes
Before sensor signal waveform occurs in Pulsed Electric Field Sensors waveform, then can be determined that and cable exists local
, in cable, there is potential defect in electric discharge.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103926494B (en) * | 2014-04-30 | 2016-09-07 | 国家电网公司 | A kind of determination method and device of interference source |
| CN104332018B (en) * | 2014-08-13 | 2017-07-04 | 国家电网公司 | A kind of magnetic information feedback method for cable termination |
| CN105372565A (en) * | 2015-11-28 | 2016-03-02 | 陈国涛 | Coiled cable partial discharge detection device |
| CN106405350A (en) * | 2016-09-28 | 2017-02-15 | 东莞市联洲知识产权运营管理有限公司 | Device for partial discharge detection of electrical device |
| CN117092455B (en) * | 2022-11-01 | 2024-06-14 | 特变电工山东鲁能泰山电缆有限公司 | Partial discharge detection device and partial discharge detection system |
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| JP2536111B2 (en) * | 1989-01-06 | 1996-09-18 | 株式会社高岳製作所 | Automatic partial discharge monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6449984A (en) * | 1987-08-19 | 1989-02-27 | Hitachi Ltd | Partial discharge diagnosing device for transformer |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2536111B2 (en) * | 1989-01-06 | 1996-09-18 | 株式会社高岳製作所 | Automatic partial discharge monitoring device |
| CN1152355A (en) * | 1995-05-02 | 1997-06-18 | Abb研究有限公司 | Monitoring of internal partial discharges on power transformer |
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